NYSE Executives: More Regulation Of Dark Pools Needed By Geoffrey Rogow, Of DOW JONES NEWSWIRES NEW YORK -(Dow Jones)- As the proliferation of dark pools continues to eat into exchanges' share of trading volume, exchanges may look to Washington for help. Executives from NYSE Euronext (NYX) said Tuesday dark pools, electronic- trading venues where money managers trade large blocks of shares anonymously, are essentially "free riding" on the stock prices they provide. In addition, as these dark pools continue to grow in volume, they are making stock prices on exchanges less legitimate, according to NYSE executives. Notably, exchanges are regulated...